﻿using Renci.SshNet.Common;

namespace Renci.SshNet.Security
{
    /// <summary>
    /// Represents "diffie-hellman-group16-sha512" algorithm implementation.
    /// </summary>
    internal class KeyExchangeDiffieHellmanGroup16Sha512 : KeyExchangeDiffieHellmanGroupSha512
    {
        /// <summary>
        /// https://tools.ietf.org/html/rfc3526#section-5
        /// </summary>
        private static readonly byte[] MoreModularExponentialGroup16Reversed =
            {
                0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x99,0x31,0x06,0x34,0xc9,0x35,0xf4,0x4d,
                0x8f,0xc0,0xa6,0x90,0xdc,0xb7,0xff,0x86,0xc1,0xdd,0x8f,0x8d,0x98,0xea,0xb4,0x93,
                0xa9,0x5a,0xb0,0xd5,0x27,0x91,0x06,0xd0,0x1c,0x48,0x70,0x21,0x76,0xdd,0x1b,0xb8,
                0xaf,0xd7,0xe2,0xce,0x70,0x29,0x61,0x1f,0xed,0xe7,0x5b,0x51,0x86,0xa1,0x3b,0x23,
                0xa2,0xc3,0x90,0xa0,0x4f,0x96,0xb2,0x99,0x5d,0xc0,0x6b,0x4e,0x47,0x59,0x7c,0x28,
                0xa6,0xca,0xbe,0x1f,0x14,0xfc,0x8e,0x2e,0xf9,0x8e,0xde,0x04,0xdb,0xc2,0xbb,0xdb,
                0xe8,0x4c,0xd4,0x2a,0xca,0xe9,0x83,0x25,0xda,0x0b,0x15,0xb6,0x34,0x68,0x94,0x1a,
                0x3c,0xe2,0xf4,0x6a,0x18,0x27,0xc3,0x99,0x26,0x5b,0xba,0xbd,0x10,0x9a,0x71,0x88,
                0xd7,0xe6,0x87,0xa7,0x12,0x3c,0x72,0x1a,0x01,0x08,0x21,0xa9,0x20,0xd1,0x82,0x4b,
                0x8e,0x10,0xfd,0xe0,0xfc,0x5b,0xdb,0x43,0x31,0xab,0xe5,0x74,0xa0,0x4f,0xe2,0x08,
                0xe2,0x46,0xd9,0xba,0xc0,0x88,0x09,0x77,0x6c,0x5d,0x61,0x7a,0x57,0x17,0xe1,0xbb,
                0x0c,0x20,0x7b,0x17,0x18,0x2b,0x1f,0x52,0x64,0x6a,0xc8,0x3e,0x73,0x02,0x76,0xd8,
                0x64,0x08,0x8a,0xd9,0x06,0xfa,0x2f,0xf1,0x6b,0xee,0xd2,0x1a,0x26,0xd2,0xe3,0xce,
                0x9d,0x61,0x25,0x4a,0xe0,0x94,0x8c,0x1e,0xd7,0x33,0x09,0xdb,0x8c,0xae,0xf5,0xab,
                0xc7,0xe4,0xe1,0xa6,0x85,0x0f,0x97,0xb3,0x7d,0x0c,0x06,0x5d,0x57,0x71,0xea,0x8a,
                0x0a,0xef,0xdb,0x58,0x04,0x85,0xfb,0xec,0x64,0xba,0x1c,0xdf,0xab,0x21,0x55,0xa8,
                0x33,0x7a,0x50,0x04,0x0d,0x17,0x33,0xad,0x2d,0xc4,0xaa,0x8a,0x5a,0x8e,0x72,0x15,
                0x10,0x05,0xfa,0x98,0x18,0x26,0xd2,0x15,0xe5,0x6a,0x95,0xea,0x7c,0x49,0x95,0x39,
                0x18,0x17,0x58,0x95,0xf6,0xcb,0x2b,0xde,0xc9,0x52,0x4c,0x6f,0xf0,0x5d,0xc5,0xb5,
                0x8f,0xa2,0x07,0xec,0xa2,0x83,0x27,0x9b,0x03,0x86,0x0e,0x18,0x2c,0x77,0x9e,0xe3,
                0x3b,0xce,0x36,0x2e,0x46,0x5e,0x90,0x32,0x7c,0x21,0x18,0xca,0x08,0x6c,0x74,0xf1,
                0x04,0x98,0xbc,0x4a,0x4e,0x35,0x0c,0x67,0x6d,0x96,0x96,0x70,0x07,0x29,0xd5,0x9e,
                0xbb,0x52,0x85,0x20,0x56,0xf3,0x62,0x1c,0x96,0xad,0xa3,0xdc,0x23,0x5d,0x65,0x83,
                0x5f,0xcf,0x24,0xfd,0xa8,0x3f,0x16,0x69,0x9a,0xd3,0x55,0x1c,0x36,0x48,0xda,0x98,
                0x05,0xbf,0x63,0xa1,0xb8,0x7c,0x00,0xc2,0x3d,0x5b,0xe4,0xec,0x51,0x66,0x28,0x49,
                0xe6,0x1f,0x4b,0x7c,0x11,0x24,0x9f,0xae,0xa5,0x9f,0x89,0x5a,0xfb,0x6b,0x38,0xee,
                0xed,0xb7,0x06,0xf4,0xb6,0x5c,0xff,0x0b,0x6b,0xed,0x37,0xa6,0xe9,0x42,0x4c,0xf4,
                0xc6,0x7e,0x5e,0x62,0x76,0xb5,0x85,0xe4,0x45,0xc2,0x51,0x6d,0x6d,0x35,0xe1,0x4f,
                0x37,0x14,0x5f,0xf2,0x6d,0x0a,0x2b,0x30,0x1b,0x43,0x3a,0xcd,0xb3,0x19,0x95,0xef,
                0xdd,0x04,0x34,0x8e,0x79,0x08,0x4a,0x51,0x22,0x9b,0x13,0x3b,0xa6,0xbe,0x0b,0x02,
                0x74,0xcc,0x67,0x8a,0x08,0x4e,0x02,0x29,0xd1,0x1c,0xdc,0x80,0x8b,0x62,0xc6,0xc4,
                0x34,0xc2,0x68,0x21,0xa2,0xda,0x0f,0xc9,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
                0x00
            };

        public override BigInteger GroupPrime
        {
            get
            {
                return new BigInteger(MoreModularExponentialGroup16Reversed);
            }
        }

        /// <summary>
        /// Gets algorithm name.
        /// </summary>
        public override string Name
        {
            get { return "diffie-hellman-group16-sha512"; }
        }
    }
}
